his 19-year-old younger to, dzhokhar tsarnaev is unaccounted for. police are trying to figure out the next piece in the puzzle so they can solve it. at the last briefing we saw two hours ago no questions were taken. that may change in a moment, martha as we wait to hear from police in watertown, massachusetts shortly. martha: all right, bill. everybody focus on the left hand side of your screen right now. maybe we can take that full at this point. this is watertown, massachusetts. we saw a woman walk out she had her hand over her mouth looking at the police trying to eug if out what is going on inside that building. we did see some of these police in unmarked cars that pulled up stop to button bulletproof vests and guns are drawn outside of, i think it's a cold frontee shop and a building, and you can see them motioning outside telling people to get away. obviously there is just so much tension as they try to find this young man, and we're looking at a wider shot at the location, a starbucks on the left. a dunkin donuts on our right as the camera wo